Gemini 4 Hydrogen

A faster Gemini 4 model for everyday coding and agent workflows, now in the Gemini app and generally available in the Gemini API.

Google positions Hydrogen as the everyday model in the Gemini 4 series. Carbon and Argon are built for deep, long-horizon reasoning, while Hydrogen focuses on speed and efficiency.
In the Gemini app it is rolling out globally on desktop, mobile, and web. Free users get it through automatic model selection when it fits the prompt.
In the Gemini API (gemini-4-hydrogen) it is generally available on the free tier, with paid pricing of $1.50 per million input tokens and $7.50 per million output tokens.
Adds a fourth thinking level, xhigh, alongside low, medium, and the default high. It is also now the default model for the Antigravity agent in Gemini Managed Agents.

Everyday coding, following instructions closely, and calling the right tools with less back-and-forth.

You want Gemini 4 speed and efficiency for routine work, and save Carbon for the hardest problems.

Gemini app users on the free tier, developers on the Gemini API, and teams building agents.

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